To which order do the following levers belong and why?
(a) A railway signal
(b) A man cutting bread with a knife
(c) A boy writing a piece of paper
(d) A nutcracker
(e) the handle of a water pump
(f) see-saw
(g) forceps
(h) A man rowing a boat
(i) A lock and key
(j) Soda water opener
(k) a door
(l) motorcarfoot brake
(m) fishing rod
(n) lemon squeezer
(a) A railway signals Lever of 1st order as the fulcrum is in between load and effort
(b) Cutting bread with a knife Lever of 3rd order as effort is in between load and fulcrum.
(c) A boy writing a piece of paper Lever of 3rd order as effort is in between load and fulcrum.
(d) A nutcracker Lever of 2nd order as the load is in between effort and fulcrum.
(e) Handle of water pump: Lever of 1st Order as the fulcrum is in between effort and load
(f) See-saw: Lever of 1st order as the fulcrum is in between load and effort
(g) Forceps: Lever of 3rd Order as effort is in between fulcrum and load.
(h) A man rowing a boat: Lever of 1st order of lever as the load is in between effort and fulcrum.
(i) Bottle Opener: Lever of 2nd order as the load is in between fulcrum and effort.
(j)Soda – water opener: Lever of 2nd Order as the load is in between fulcrum and effort.
(k)A door: Lever of 2nd order the load is in between effort and fulcrum.
(l)Motorcar foot brake: Lever of 3rd order as effort is in between load and fulcrum.
(m)A fishing rod: Lever of 3rd order as effort is in between fulcrum and load.
(n)Lemon squeezer: Lever of 2nd order as the load is in between fulcrum and effort.